Dp Slave Diagnostics - Siemens CM 1542-5 Operating Instructions Manual

Diagnostics and upkeep

5.2 DP slave diagnostics

5.2 DP slave diagnostics
DP-V1 slave: Diagnostics interrupt
The diagnostics data is transferred as a diagnostics interrupt. Diagnostics interrupts must be
acknowledged by the DP master.
Supported diagnostics functions
The CM 1542-5 supports the following blocks of DP diagnostics:
● Standard diagnostics (6 bytes)
● Identifier-related diagnostics (2 to 17 bytes), depending on the number of configured
transfer areas
● Module status (5 to 35 bytes), depending on the number of configured transfer areas
● If it exists: Diagnostics interrupt (8 bytes)
User program (DP master)
To read out the diagnostics data of the DP slave (DP single diagnostics), use the
"DPNRM_DG" instruction on the DP master.
Diagnostics interrupts of DP-V1 slaves are evaluated in the user program of the master
using the "RALRM" instruction.
You will find the required parameter assignment for the instructions in the STEP 7 online
help.
Below, there is an overview of the structure of the diagnostics data.
Overview of standard diagnostics
36
Byte
0
1
2
3
4...5
Standard diagnostics
Meaning
Station status 1
Station status 2
Station status 3
Master address
Vendor ID of the slave
Operating Instructions, 11/2018, C79000-G8976-C290-04
CM 1542-5